JPH11166657A - Driving device for solenoid valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the number of switching means required to control driving of valve element by collectively arranging the switcing means with every valve element group so as to control a current-carrying state to electromagnets arranged in response to the respective valve bodies of the valve element group composed of plural valve elements. SOLUTION: This driving device for solenoid valves has an electronic control unit (ECU) 10 and the solenoid valves, and a crank position sensor (CP sensor) 14 is connected to the ECU 10. The ECU 10 has a driving circuit 74, and the driving circuit 74 has nine electric field effect transistors(FET) #1 to #9 FET 80 to 96 to function as a switching means. The #1 to #9 FET 80 to 96 connect #1/#2 lower coils 541 and 542 of two solenoid valves to constitute intake valves and #1/#2 upper coils 481 and 482 between source terminals. Both two intake valves of respective cylinders open/close in the same timing. The number of switching means can be reduced thereby.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drive device for an electromagnetic valve, and more particularly to a plurality of valve bodies, such as a plurality of intake valves and exhaust valves provided in each cylinder of an internal combustion engine, operating in synchronization with each other. The present invention relates to a driving device for an electromagnetic valve suitable for driving the electromagnetic valve.

[0002]

2. Description of the Related Art Conventionally, Japanese Patent Application Laid-Open No. 8-28462
As disclosed in No. 6, an electromagnetic valve used as an intake or exhaust valve of an internal combustion engine is known. This electromagnetic valve includes an armature displaced integrally with the valve body, a pair of electromagnetic coils disposed above and below the armature, and a spring for urging the valve body toward a neutral position.

When no exciting current is supplied to any of the electromagnetic coils, the valve body and the armature are held at the neutral position. Also, when the exciting current is supplied to the upper electromagnetic coil, the valve element and the armature are attracted toward the upper electromagnetic coil, while when the exciting current is supplied to the lower electromagnetic coil, , The valve element and the armature are sucked toward the lower electromagnetic coil. Therefore, according to the above-mentioned conventional electromagnetic valve, the valve element can be opened and closed by supplying an appropriate exciting current to each electromagnetic coil alternately. In this case, the displacement ends of the valve body on the valve closing side and the valve opening side are regulated by the armature being attracted to the electromagnetic coil. Therefore, if the electromagnetic force generated by the electromagnetic coil can be quickly eliminated in the vicinity of the displacement end of the valve body, high operation responsiveness of the electromagnetic valve can be realized, and
By reducing the impact force between the armature and the electromagnetic coil, it is possible to suppress the impact sound and improve the durability.

[0004] For this purpose, in the above-mentioned conventional solenoid valve, the exciting current supplied to each electromagnetic coil is controlled by an H-type bridge circuit. This H-type bridge circuit is composed of a total of four switching means provided between each terminal of the electromagnetic coil and the positive and negative electrodes of the power supply. According to such an H-bridge circuit, a voltage in a predetermined direction is applied to the electromagnetic coil by turning on one of the switching means and turning off the other of the switching means located diagonally across the electromagnetic coil. can do. In addition, by inverting the on / off state, a voltage in a direction opposite to the predetermined direction can be applied to the electromagnetic coil. Therefore, when the valve body approaches the displacement end, the on / off state of each switching means of the H-type bridge circuit is switched, and a voltage in a direction opposite to the exciting current is applied to the electromagnetic coil. The generated electromagnetic force can be quickly eliminated.

[0005]

However, as described above, the above-described conventional electromagnetic valve requires four switching means for each electromagnetic coil. That is, since one electromagnetic valve includes two electromagnetic coils, eight switching means are required for one electromagnetic valve. Therefore, for example, when the above-described conventional electromagnetic valve is applied to a four-cylinder four-valve engine, 128 switching means are required, and the cost of a driving device for driving the electromagnetic valve increases.

The present invention has been made in view of the above points, and has as its object to reduce the number of switching means required for controlling an exciting current to an electromagnetic coil for driving a valve element. Still another object of the present invention is to provide an electromagnetic valve driving device capable of rapidly eliminating the electromagnetic force generated by the electromagnetic coil after driving the valve body while reducing the number of switching means.

[0007]

The above object is achieved by the present invention.
As described in the above, in the electromagnetic valve driving device that at least one valve group consisting of a plurality of valve bodies is driven to open and close synchronously for each valve body group by an electromagnet provided corresponding to each valve body, The switching means for controlling the energization state of the electromagnet is achieved by an electromagnetic valve driving device including a driving circuit provided collectively for each valve element group.

According to the first aspect of the present invention, the valves belonging to each valve group are driven synchronously with each other by an electromagnetic force generated by an electromagnet. Switching means for controlling the energization state of the electromagnet is provided collectively for each valve element group. Therefore, there is no need to provide switching means for each electromagnet, and the number of switching means is reduced.

Further, the above object is achieved by a driving apparatus for an electromagnetic valve according to the present invention.
This is achieved by an electromagnetic valve driving device that suspends driving of at least one valve element belonging to each valve element group under a predetermined condition. According to the second aspect of the present invention, the driving of at least one valve element belonging to each valve element group is stopped by a combination of ON / OFF states of the switching means under a predetermined condition. Therefore, even when the valve bodies of each valve body group are not simultaneously opened and closed, the number of switching means can be reduced.

According to a third aspect of the present invention, in the driving device for an electromagnetic valve according to the first or second aspect, each of the valve element groups is composed of two valve elements, and A first electromagnet for driving the valve element in a first predetermined direction and a second electromagnet for driving the valve element in a second predetermined direction, wherein the driving circuit includes a first power supply terminal on the high voltage side and a low voltage side. And a third series circuit in which three switching means are connected in series with the second power supply terminal on the side, and the four electromagnets corresponding to each valve element group are connected in series with the switching means. This is achieved by an electromagnetic valve driving device arranged so as to connect between the series circuits.

According to the third aspect of the present invention, two valve elements belonging to each valve element group are driven by a total of four electromagnets. The drive circuit includes three series circuits in which three switching means are connected in series. That is, nine switching means are provided for four electromagnets. 4
Each of the two electromagnets is arranged to connect between the series circuits. Therefore, by combining the ON / OFF states of the switching means of each series circuit, an exciting current in both directions can be supplied to each electromagnet, and a current flowing through each electromagnet can flow into the first power supply terminal. .

According to a fourth aspect of the present invention, in the driving apparatus for an electromagnetic valve according to the first or second aspect, each of the valve element groups includes two valve elements. A first electromagnet for driving the valve body in a first predetermined direction and a second electromagnet for driving the valve body in a second predetermined direction, wherein the driving circuit includes a first power supply terminal on a high voltage side; A first and a second series circuit in which three switching means are connected in series between the second power supply terminal on the low voltage side, and a first and a second series circuit between the first power supply terminal and the second power supply terminal. Two switching means, and one diode arranged so as to allow current to flow from the second power supply terminal side to the first power supply terminal side, and are serially connected such that the diode is located at the center. And a third series circuit formed for each valve element group. That said four electromagnets, the third
This is achieved by an electromagnetic valve driving device connected between a connection between the switching means of the series circuit and the diode and a connection between the switching means of the first and second series circuits.

According to the fourth aspect of the present invention, two valve elements belonging to each valve element group are driven by a total of four electromagnets. The drive circuit includes first and second series circuits in which three switching means are connected in series, and diodes connected in series between the two switching means to allow current flow from the low voltage side to the high voltage side. And a third series circuit. That is, eight switching means and one diode are provided for four electromagnets. 4
The two electromagnets are respectively connected between the third series circuit and the first or second series circuit. Therefore, an exciting current in a predetermined direction can be supplied to each electromagnet by a combination of on / off states of the switching means of each series circuit, and an exciting current flowing through each electromagnet flows into the first power supply terminal. Can be.

According to a fifth aspect of the present invention, in the driving apparatus for an electromagnetic valve according to the first or second aspect, each of the valve element groups includes two valve elements, and A first electromagnet for driving the valve body in a first predetermined direction and a second electromagnet for driving the valve body in a second predetermined direction, wherein the drive circuit includes the first power supply terminal and the first A first to a third series circuit having first to third switching means respectively connected in series from the first power supply terminal side to the second power supply terminal. The four electromagnets are respectively connected between a connection between the first and second switching means of the first series circuit and a connection between the first and second switching means of the second series circuit, The connection of the second and third switching means of the first series circuit Between the connection part of the second series circuit and the connection part of the second and third switching means, and the connection part of the first and second switching means of the second series circuit and the connection part of the third series circuit. Between the connection of the first and second switching means, and between the connection of the second and third switching means of the second series circuit and the second and third switching of the third series circuit. This is achieved by a drive for the solenoid valve connected between the connection of the means.

According to the fifth aspect of the present invention, two valve elements belonging to each valve element group are driven by a total of four electromagnets. The drive circuit includes first to third series circuits in which first to third switching means are connected in series between the first power terminal and the second power terminal. That is, nine switching means are provided for four electromagnets. The four electromagnets are connected between the series circuits. For example, for an electromagnet connected between the connection of the first and second switching means of the first series circuit and the connection of the first and second switching means of the second series circuit, When the first switching means of the second series circuit and the second and third switching means of the first series circuit are turned on, the current flows from the second series circuit side to the first series circuit side. A state where an exciting current in a direction (hereinafter, referred to as a first direction) is supplied is formed. When the first switching means of the first series circuit and the second and third switching means of the second series circuit are turned on, the exciting current flowing in the first direction becomes the first state. , Or a state where an exciting current in a direction opposite to the first direction is supplied. Similarly, the other electromagnets are formed in the same state by the combination of the ON / OFF states of the switching means.

According to a sixth aspect of the present invention, in the driving apparatus for an electromagnetic valve according to the first or second aspect, each of the valve element groups includes two valve elements. A first electromagnet for driving the valve body in a first predetermined direction and a second electromagnet for driving the valve body in a second predetermined direction, wherein the drive circuit includes the first power supply terminal and the first A first and a second series circuit respectively having first to third switching means connected in series from the first power supply terminal side to the second power supply terminal; First switching means connected in series from the first power supply terminal to the second power supply terminal to allow current flow from the second power supply terminal to the first power supply terminal; A diode provided to
A third series circuit having switching means of
The four electromagnets are respectively connected between a connection of the first and second switching means of the first series circuit and a connection of the first switching means and the diode of the third series circuit. Between the connection of the second and third switching means of the first series circuit and the connection of the diode and the second switching means of the third series circuit; Between the connection part of the switching means and the connection part of the first switching means and the diode of the third series circuit, and the connection part of the second and third switching means of the second series circuit, Third
This is achieved by an electromagnetic valve driving device connected between the diode of the series circuit and the connection portion of the second switching means.

According to the invention described in claim 6, two valve bodies belonging to each valve body group are driven by a total of four electromagnets. The drive circuit includes: first and second series circuits each including first to third switching means connected in series between a first power supply terminal and a second power supply terminal; A second diode configured to allow a current to flow from the second power terminal to the first power terminal, and a second switching means connected in series from the first power terminal to the second power terminal. 3 series circuits. That is, 4
Eight switching means and one diode are provided for one electromagnet. The four electromagnets are the first or second
And a third series circuit between the first series circuit and the third series circuit. For example, for an electromagnet connected between the connection between the first and second switching means of the first series circuit and the connection between the first switching means and the diode of the third series circuit, The first switching means of the third series circuit and the second and third switching means of the first series circuit are turned on, so that the third series circuit goes to the first series circuit. A state is formed in which the exciting current in the first direction is supplied. Further, when the first switching means of the first series circuit and the second switching means of the third series circuit are turned on, the exciting current flowing in the first direction is supplied to the first power supply terminal. Is formed. Similarly, the other electromagnets are formed in the same state by the combination of the ON / OFF states of the switching means.

Further, the above object is achieved by a driving apparatus for an electromagnetic valve according to a fifth aspect.
A first electromagnet corresponding to one valve element of each valve element group is connected to a connection portion of the first and second switching means of the first series circuit and a first and a second of the second series circuit. A second electromagnet connected between the connection portion of the first series circuit and the second electromagnet connected to the connection portion of the first series circuit and the second electromagnet connected to the connection portion of the first series circuit; A first electromagnet, which is connected between the series circuit and a connection portion with the second and third switching means and corresponds to the other valve element, is connected to the second and third switching means of the second series circuit. And the second electromagnet connected between the second series circuit and the second and third switching means of the third series circuit, and the second electromagnet corresponding to the other valve element is connected to the second series circuit of the second series circuit. A connection part of the first and second switching means and a first part of the third series circuit;
And the electromagnetic valve driving device connected between the second switching means and the connection portion.

In the invention according to claim 7, the first electromagnet corresponding to one of the valve bodies (hereinafter, referred to as a first valve body) of each valve body group is a first electromagnet of the first series circuit. Is connected between the connection part of the switching means and the connection part of the second series circuit with the first and second switching means. Also,
The second electromagnet corresponding to the first valve body is connected to a connection between the second and third switching means of the first series circuit and a connection between the second and third switching means of the second series circuit. Connected between In addition, the other valve element of each valve element group (hereinafter, referred to as
The first electromagnet corresponding to the second valve body) is connected to the connection between the second and third switching means in the second series circuit and the connection between the second and third switching means in the third series circuit. Connected between the unit. Further, the second valve corresponding to the second valve element
Is connected between the connection of the first and second switching means of the second series circuit and the connection of the first and second switching means of the third series circuit.

The first and second switching means of the first series circuit, the first and third switching means of the second series circuit, and the second and third switching means of the third series circuit When turned on, an exciting current is supplied to the second electromagnet of the first valve body in a direction from the first series circuit side to the second series side, and the second electromagnet of the second valve body is supplied with the second magnet. 2
The state where the exciting current is supplied in the direction from the series circuit side toward the third series circuit side is formed. Further, the second and third switching means of the first series circuit, the first and third switching means of the second series circuit, and the first and second switching means of the third series circuit are in the ON state. Then, an exciting current in a direction from the second series circuit toward the first series circuit is supplied to the first electromagnet of the first valve body, and the third electromagnet of the second valve body is supplied with the third electromagnet. A state where the exciting current is supplied in the direction from the series circuit side to the second series circuit side is formed. Hereinafter, the direction of the exciting current supplied to each electromagnet in these two states is referred to as a positive direction, and the opposite direction is referred to as a reverse direction. Further, a state in which a positive exciting current is supplied to the electromagnet is referred to as a power supply state.

On the other hand, when the third switching means of the first series circuit, the second switching means of the second series circuit, and the first switching means of the third series circuit are turned on, A positive exciting current flowing through the second electromagnet of the one valve body and the second electromagnet of the second valve body flows into the first power supply terminal side, or an exciting current of the opposite direction flows through these two electromagnets. A supply state is formed. Hereinafter, a state in which the positive exciting current flowing through the electromagnet flows into the first power supply terminal side or a state in which the reverse exciting current is supplied to the electromagnet is referred to as a regenerative / reverse current state of the electromagnet. Also,
When the first switching means of the first series circuit, the second switching means of the second series circuit, and the third switching means of the third series circuit are turned on, the first switching means of the first valve body is turned on. The first electromagnet and the first electromagnet of the second valve body are regenerated.
A state of a reverse current state is formed.

When the first and second switching means of the first series circuit and the third switching means of the second series circuit are turned on, the second electromagnet of the first valve body supplies power. A state is formed. Further, when the first switching means of the second series circuit and the second and third switching means of the third series circuit are turned on, the second electromagnet of the second valve body is switched to the power supply state. The formed state is formed.

A first switching means of the second series circuit;
When the second and third switching means of the third series circuit are turned on, a state is established in which the second electromagnet of the second valve body is in the power supply state. When the first and second switching means of the first series circuit and the third switching means of the second series circuit are turned on,
The state where the second electromagnet of the first valve body is in the power supply state is formed.

When the third switching means of the first series circuit and the first and second switching means of the second series circuit are turned on, the second electromagnet of the first valve body is regenerated. A state of a reverse current state is formed. Further, when the second and third switching means of the second series circuit and the first switching means of the third series circuit are turned on, the second electromagnet of the second valve body is regenerated and inverted. A current state is formed.

Second and third switching means of the first series circuit, first switching means of the second series circuit,
When the second and third switching means of the third series circuit are turned on, the first electromagnet of the first valve body and the second electromagnet of the second valve body are in a power supply state. The formed state is formed. In addition, the first and second circuits of the first series circuit
When the switching means, the third switching means of the second series circuit, and the first and second switching means of the third series circuit are turned on, the first electromagnet of the second valve body, And the state where the second electromagnet of the first valve body is in the power supply state is formed.

When the second and third switching means of the first series circuit and the first switching means of the second series circuit are turned on, the first solenoid valve of the first valve body is turned on. The supply state is formed. Further, when the third switching means of the second series circuit and the first and second switching means of the third series circuit are turned on, the first electromagnet of the second valve body is in the power supply state. Is formed.

When the first switching means of the second series circuit and the second and third switching means of the third series circuit are turned on, the second electromagnet of the second valve body supplies power. A state is formed. A first and a second switching means of the first series circuit;
When the third switching means of the series circuit is turned on, a state in which the second electromagnet of the first valve body is in the power supply state is formed.

When the first switching means of the first series circuit and the second and third switching means of the second series circuit are turned on, the first electromagnet of the first valve element regenerates. -A state of a reverse current state is formed. Also,
When the first and second switching means of the second series circuit and the third switching means of the third series circuit are turned on, the first electromagnet of the second valve element regenerates and reverses current. A state is formed.

As described above, according to the present invention, according to the nine switching means, the first or second valve body and / or the first or second valve body can be selected according to the combination of the ON / OFF states. Can be in a power supply state or a regenerative / reverse current state. In the regenerative / reverse current state, the exciting current flowing through the electromagnet rapidly decreases, and the electromagnetic force generated by the electromagnet quickly disappears by supplying the exciting current in the reverse direction. Therefore, by appropriately realizing the power supply state and the regenerative / reverse current state of each electromagnet according to the operation of the valve element, the electromagnetic force acting on the valve element can be quickly eliminated after the valve element is driven.

According to another aspect of the present invention, there is provided a driving device for an electromagnetic valve according to the present invention.
A first electromagnet corresponding to one of the valve bodies of each valve body group is connected to a connection between the first and second switching means of the first series circuit and the first switching means of the third series circuit; A second electromagnet connected between the connection portion of the diode and the second electromagnet corresponding to the one valve body is connected to the connection portion of the second and third switching means of the first series circuit and the connection of the third series circuit. A first electromagnet connected between the second switching means and the connection portion of the diode and corresponding to the other valve element;
It is connected between the connection of the second and third switching means of the second series circuit and the connection of the second switching means and the diode of the third series circuit, and corresponds to the other valve element. Valve connecting a second electromagnet to be connected between a connection of the first and second switching means of the second series circuit and a connection of the first switching means and the diode of the third series circuit. This is achieved by a driving device. .

In the invention according to claim 8, the first electromagnet corresponding to one of the valve bodies (hereinafter, referred to as a first valve body) of each valve body group is composed of the first and second electromagnets of the first series circuit. Is connected between the connection part of the switching means and the connection part of the first switching means and the diode of the third series circuit. Also, the second electromagnet corresponding to the first valve body is connected to a connection between the second and third switching means of the first series circuit and a connection between the second switching means and the diode of the third series circuit. Connected between The first electromagnet corresponding to the other valve element (hereinafter, referred to as a second valve element) of each valve element group is:
It is connected between the connection of the second and third switching means of the second series circuit and the connection of the second switching means and the diode of the third series circuit. Further, the second electromagnet corresponding to the second valve body is connected to the connection between the first and second switching means of the second series circuit and the connection between the first switching means and the diode of the third series circuit. Connected between

The first and second switching means of the first series circuit, the second and third switching means of the second series circuit, and the first and third switching means of the third series circuit are turned on. In this state, an exciting current in a direction from the first series circuit toward the third series circuit is supplied to the second electromagnet of the first valve body, and the second electromagnet of the second valve body is supplied with the second magnet. A state is formed in which the exciting current is supplied in the direction from the third series circuit side to the second series circuit side. Further, the second and third switching means of the first series circuit, the first and second switching means of the second series circuit, and the first and third switching means of the third series circuit are turned on. Then, an exciting current in a direction from the third series circuit side toward the first series circuit side is supplied to the first electromagnet of the first valve body, and the second electromagnet of the second valve body is supplied to the first electromagnet of the second valve body. A state is formed in which the exciting current is supplied in the direction from the series circuit side to the third series circuit side. Hereinafter, the direction of the exciting current supplied to each electromagnet in these two states is referred to as a positive direction, and the opposite direction is referred to as a reverse direction. Further, a state in which a positive exciting current is supplied to the electromagnet is referred to as a power supply state.

On the other hand, when the third switching means of the first series circuit and the first switching means of the second series circuit are turned on, the second electromagnet of the first valve body and the second valve A state is formed in which the positive exciting current flowing through the second electromagnet of the body flows into the first power supply terminal. Hereinafter, a state in which the positive exciting current flowing through the electromagnet flows into the first power supply terminal side is referred to as a regenerative state of the electromagnet. Also,
When the first switching means of the first series circuit and the third switching means of the second series circuit are turned on, the first electromagnet of the first valve body and the first electromagnet of the second valve body are turned on. A state in which the electromagnet is in a regenerative state is formed.

When the first and second switching means of the first series circuit and the third switching means of the third series circuit are turned on, the second electromagnet of the first valve element is turned on. Is formed. Further, when the second and third switching means of the second series circuit and the first switching means of the third series circuit are turned on, the second electromagnet of the second valve body is in a power supply state. Is formed.

When the second and third switching means of the second series circuit and the first switching means of the third series circuit are turned on, the second electromagnet of the second valve element is turned on. Is formed. When the first and second switching means of the first series circuit and the second switching means of the third series circuit are turned on,
The state where the second electromagnet of the first valve body is in the power supply state is formed.

When the third switching means of the first series circuit and the first switching means of the second series circuit are turned on, the second electromagnet of the first valve body is brought into a regenerative state. A state is formed. Further, when the first switching means of the second series circuit and the second switching means of the third series circuit are turned on, the second switching element of the second valve body is turned on.
Is formed in a regenerative state.

The second and third switching means of the first series circuit, the second and third switching means of the second series circuit, and the first switching means of the third series circuit are turned on. Then, a state is established in which the first electromagnet of the first valve body and the second electromagnet of the second valve body are in the power supply state. In addition, the first and second circuits of the first series circuit
When the switching means, the first and second switching means of the second series circuit, and the second switching means of the third series circuit are turned on, the first electromagnet of the second valve body, And the state where the second electromagnet of the first valve body is in the power supply state is formed.

When the second and third switching means of the first series circuit and the first switching means of the third series circuit are turned on, the first solenoid valve of the first valve body is turned on by the power supply. The supply state is formed. Also, when the first and second switching means of the second series circuit and the second switching means of the third series circuit are turned on, the first electromagnet of the second valve body is in a power supply state. Is formed.

When the second and third switching means of the second series circuit and the first switching means of the third series circuit are turned on, power is supplied to the second electromagnet of the second valve body. A state is formed. Further, when the first and second switching means of the first series circuit and the second switching means of the third series circuit are turned on, the second electromagnet of the first valve body is in a power supply state. Is formed.

When the first switching means of the first series circuit and the second switching means of the third series circuit are turned on, the first electromagnet of the first valve body is brought into a regenerative state. A state is formed. Further, when the third switching means of the second series circuit and the first switching means of the third series circuit are turned on, the first electromagnet of the second valve body is in the regenerative / reverse current state. Is formed.

As described above, according to the present invention, the eight or more switching means and one diode are used to select one or both of the first and second valve bodies according to the combination of ON / OFF states of each switching means. The first or second electromagnet can be in a power supply state or a regenerative state. In the regenerative state, the electromagnetic force generated by the electromagnet quickly disappears because the exciting current flowing through the electromagnet decreases rapidly. Therefore, by appropriately realizing the power supply state and the regenerative state of each electromagnet in accordance with the operation of the valve element, the electromagnetic force acting on the valve element can be quickly eliminated after driving the valve element.

According to a ninth aspect of the present invention, in the driving device for an electromagnetic valve according to any one of the third to eighth aspects, each of the switching means performs an on / off operation. This is achieved by an electromagnetic valve driving device having a switching element and a diode provided in parallel with the switching element to allow a current to flow from the second power supply terminal side to the first power supply terminal side. Is done.

In the ninth aspect of the present invention, each switching means includes a switching element that performs on / off operation,
In parallel with the switching element, the first
And a diode provided so as to allow a current to flow toward the power supply terminal side. Therefore, each switching means allows the flow of current from the second power supply terminal side to the first power supply terminal side even when the switching means is in the off state. For this reason, when the supply of the exciting current to the electromagnet is cut off, the on / off state of the switching means is set so that the closed circuit including the diode and the electromagnetic coil of the switching means is conducted. Flywheel current can flow through the electromagnet.

According to a tenth aspect of the present invention, in the driving device for an electromagnetic valve according to the first or second aspect, the combination of the on / off states of the switching means is switched so that the electromagnet is driven. This is achieved by an electromagnetic valve driving device that supplies an exciting current having a predetermined current waveform to each.

According to the tenth aspect of the present invention, an exciting current having a predetermined current waveform is supplied to each electromagnet by switching a combination of ON / OFF states of the switching means. Therefore, according to the present invention, it is possible to control the current waveform of the exciting current supplied to the electromagnet while reducing the number of switching means. In addition, the above object is achieved by the electromagnetic valve driving device according to claim 9, wherein the predetermined current waveform is a predetermined positive current waveform portion, and This is achieved by a driving device for an electromagnetic valve including a reverse current waveform section in a reverse direction.

In the eleventh aspect, when a positive exciting current is supplied to the electromagnet, the valve body is driven by the electromagnet. On the other hand, when the exciting current in the opposite direction is supplied to the electromagnet after the valve body is driven, the electromagnetic force generated by the electromagnet is quickly eliminated. Therefore, since the current waveform of the excitation current supplied to the electromagnet includes the positive current waveform portion and the reverse current waveform portion, after the valve body is driven by the electromagnetic force generated by the electromagnet, the electromagnetic force quickly disappears. I do.

[0047]

FIG. 1 shows a system configuration diagram of a drive device for an electromagnetic valve according to an embodiment of the present invention. The electromagnetic valve driving device according to the present embodiment includes an electronic control unit (hereinafter, referred to as an ECU) 10 and an electromagnetic valve 12. The ECU 10 is connected to a crank position sensor (hereinafter, referred to as a CP sensor).

The CP sensor 14 outputs a reference signal and a crank angle signal. The reference signal is output each time the crank angle of the internal combustion engine matches a predetermined reference angle. The ECU 10 detects the crank angle of the internal combustion engine based on the output signal of the CP sensor 14, and controls the electromagnetic valve 12 using the detection result. The electromagnetic valve 12 includes a valve body 16. In this embodiment, the electromagnetic valve 12
Is applied to a 4-cylinder 4-valve internal combustion engine. That is, four solenoid valves 12 are provided for each cylinder of the internal combustion engine, and the valve bodies 16 of the two solenoid valves 12 constitute intake valves, and the valve bodies 1 of the other two solenoid valves 12 are provided.
Reference numeral 6 denotes an exhaust valve.

The valve body 16 is disposed on the cylinder head 18 so as to be exposed in the combustion chamber of the internal combustion engine. An intake port (or exhaust port) 20 is provided in a cylinder head 18 of the internal combustion engine. A valve seat 22 for the valve body 16 is formed in the intake port (or exhaust port) 20. The intake port (or exhaust port) 20 is a valve body 1
When the valve 6 is seated on the valve seat 22, the conductive state is established, and when the valve body 16 is seated on the valve seat 22, the closed state is established.

A valve shaft 24 is fixed to the valve body 16. The valve shaft 24 is slidably held in the axial direction by a valve guide 26. The valve guide 26 is supported by the cylinder head 18. Also, the valve guide 26
, A lower cap 28 of the electromagnetic valve 12 is fixed. An armature shaft 30 made of a non-magnetic member is provided above the valve shaft 24. A lower retainer 32 is fixed to the upper end of the valve shaft 24. A lower spring 34 is provided between the lower retainer 32 and the lower cap 28. The lower spring 34 urges the lower retainer 32, that is, the armature shaft 30 and the valve body 16 upward in FIG.

An upper retainer 36 is fixed to the upper end of the armature shaft 30. An upper spring 38 is provided on the upper part of the upper retainer 36. The upper spring 38 urges the retainer 36, that is, the armature shaft 30 and the valve body 16 downward in FIG. Around the upper spring 38,
A cylindrical upper cap 40 is provided. An adjust bolt 42 is provided at the upper end of the upper cap 40. The upper end of the upper spring 38 is in contact with the adjuster bolt 42.

An armature 44 is joined to the armature shaft 30. The armature 44 is an annular member composed of a magnetic member. Above the armature 44, a first electromagnet 46 is provided. The first electromagnet 46 includes an upper coil 48 and an upper core 50. A second electromagnet 52 is provided below the armature 44. The second electromagnet 52 includes a lower coil 54 and a lower core 56.

The upper coil 48 and the lower coil 54
It is connected to the ECU 10. An excitation current is supplied from the ECU 10 to the upper coil 48 and the lower coil 54. The upper core 50 and the lower core 56 are members made of a magnetic material, and slidably hold the armature shaft 30 at a central portion thereof. The first electromagnet 46 and the second electromagnet 52 are held by the outer cylinder 58 so that a predetermined interval is held therebetween. The neutral position of the armature 44 is adjusted by the adjuster bolt 42 to the first position.
It is adjusted to an intermediate point between the electromagnet 46 and the second electromagnet.

Next, the operation of the electromagnetic valve 12 will be described. In the electromagnetic valve 12, a magnetic flux can be generated by the upper coil 48 by supplying an exciting current to the upper coil 48. The magnetic flux generated by the upper coil 48 flows through a path including the upper core 50 and the armature 44. At this time, the armature 44 and the first
The armature 44 is provided between the first electromagnet 4 and the electromagnet 46.
Electromagnetic force is generated in the direction of suction to 6.

Therefore, according to the electromagnetic valve 12, by supplying an appropriate exciting current to the upper coil 48, the armature 44, the armature shaft 30, the valve body 16 and the like can be displaced to the first electromagnet 46 side. it can. The armature shaft 30 can be displaced toward the first electromagnet 46 until the armature 44 contacts the upper core 50. Valve body 1
6 closes the intake port (or exhaust port) 20 under the situation where the armature 44 contacts the upper core 50.
Therefore, according to the electromagnetic valve 12, by supplying an appropriate exciting current to the upper coil 48, the valve body 16 can be brought into the fully closed state.

When the valve body 16 is maintained in the fully closed state, the upper spring 38 and the lower spring 34
The armature shaft 30 is urged toward the neutral position. When the supply of the exciting current to the upper coil 48 is stopped in such a situation, the armature shaft 30
8 and a simple vibration motion is started in accordance with the spring force of the lower spring 34.

According to the electromagnetic valve 12, the lower coil 54
By supplying an exciting current to the lower coil 54, a magnetic flux can be generated by the lower coil 54. The magnetic flux generated by the lower coil 54 flows through a path including the lower core 56 and the armature 44. At this time, an electromagnetic force is generated between the armature 44 and the second electromagnet 52 so as to attract the armature 44 to the second electromagnet 52. Therefore, according to the electromagnetically driven valve 12, by supplying an appropriate exciting current to the lower coil 54, the energy loss caused by the sliding of the armature shaft 30 is compensated, and the armature 44 contacts the second electromagnet 52 until the armature 44 contacts the second electromagnet 52. The shaft 30 can be displaced.

The valve element 16 is fully opened when the armature 44 comes into contact with the second electromagnet 52. Therefore, according to the electromagnetic valve 12, the supply of the excitation current to the upper coil 48 is stopped, and then the supply of the excitation current to the lower coil 54 is started at a predetermined timing. Can be changed to When the supply of the excitation current to the lower coil 54 is stopped after the valve body 16 has reached the fully open state, the valve body 16 starts displacing toward the fully closed position according to the operation of the simple vibration. Thereafter, the valve body 16 can be opened and closed by repeatedly supplying an exciting current to the upper coil 48 and the lower coil 54 at an appropriate timing.

When the valve body 16 is opened and closed, the armature 44 is connected to the first electromagnet 46 or the second electromagnet 5.
Armature 44 and first electromagnet 4 at the time of contact with
If the electromagnetic attraction between the sixth and second electromagnets 52 can be reduced to zero, the impact acting between them can be reduced,
The generation of impact noise can be suppressed, and the durability of the electromagnetic valve 12 can be improved. Further, in this case, since the armature 44 can be quickly separated from the first electromagnet 46 or the second electromagnet 52, excellent responsiveness of the electromagnetic valve 12 can be realized. From this viewpoint, it is desirable that the electromagnetic attraction between the armature 44 and the first electromagnet 46 or the second electromagnet 52 be quickly eliminated at a desired timing.

However, even if the supply of the exciting current to the upper coil 48 is stopped, for example, due to the back electromotive force generated in the upper coil 48, the upper coil 4
8, a current in the same direction as the supplied exciting current continues to flow. Further, even if the current flowing through the upper coil 48 decreases and reaches zero, an electromagnetic attraction force acts between the armature 44 and the first electromagnet 46 for a certain period due to eddy currents generated in the armature 44 and the upper core 50. . Therefore, in order to quickly eliminate the electromagnetic attraction between the armature 44 and the first electromagnet 46, the upper coil 4
8 quickly extinguishes the current associated with the back electromotive force,
It is necessary to quickly eliminate the eddy current generated in the armature 44 and the upper coil 48 as well.

From this point of view, it is effective to stop the supply of the exciting current to the upper coil 48 and then allow the exciting current to flow in the upper coil 48 in the reverse direction for a predetermined period. Similarly, in order to quickly eliminate the electromagnetic attraction force between the armature 44 and the second electromagnetic coil 52, the supply of the exciting current to the lower coil 54 is stopped, and then the lower coil 5
4, it is effective to allow the exciting current to flow in the reverse direction for a predetermined period. That is, by supplying a current in the opposite direction to the coil, the eddy current can be canceled out, whereby the electromagnetic attraction can be eliminated quickly.

FIG. 2 shows the current waveform (FIG. 2A) of the exciting current used in the electromagnetic valve 12 from the above viewpoint.
(B)) and the valve element 16 obtained from the current waveform
(FIG. 2 (c)). As shown in FIG. 2A, the exciting current supplied to the upper coil 48 is generated during the suction period (the periods A and B shown in FIG. 2A) in which the valve element 16 is displaced from the fully open position to the fully closed position. after being controlled to the maximum exciting current I _MAX predetermined period (shown in FIGS. 2 (a) a), almost synchronism with the timing of the valve body 16 reaches the fully closed position, the transition period (FIGS. 2 (a) through time B) shown in is controlled so as to coincide with the holding current I _H (FIG. 2
Period C) shown in FIG. This exciting current is controlled to a degaussing current I _R directed in a direction opposite to the maximum exciting current I _MAX when a request for closing the valve body 16 from the fully open position is generated (see FIG. 2A). Period D).

Similarly, as shown in FIG. 2B, the exciting current supplied to the lower coil 54 is applied to the suction period during which the valve body 16 is displaced from the fully closed position to the fully open position (FIG. 2).
In periods A and B shown in (b), a predetermined period (FIG. 2)
(B) Period A) shown only after being maintained at a predetermined value I _MAX, which is controlled so as to decrease toward the predetermined holding current I _H through the transition period period shown in (FIG. 2 (b) B) (Figure 2
Period C) shown in (b). The exciting current is controlled to the demagnetizing current I _R going in the opposite direction when a request to close the valve body 16 from the fully open position occurs (period C shown in FIG. 2B).

By setting the timing of supplying the exciting current to the upper coil 48 and the lower coil 54 based on the output signal of the CP sensor 14, the electromagnetic valve 12 can be opened and closed in synchronization with the operation of the internal combustion engine. it can. The current waveform of the exciting current supplied to the above-described upper coil 48 and lower coil 54 has an EC
U10 is realized by appropriately switching between a state in which a forward exciting current is supplied to the upper coil 48 and the lower coil 54 and a state in which a reverse exciting current is supplied thereto.

The electromagnetic valve driving device of the present embodiment is an EC driving device.
While suppressing the number of switching means provided in U10,
It is characterized in that the desired current waveform as described above can be realized by reversing the direction of the excitation current supplied to the upper coil 48 and the lower coil 54. Hereinafter, FIG.
The internal structure of the ECU 10 will be described with reference to FIG. FIG. 3 is a circuit diagram illustrating the internal structure of the ECU 10. FIG.
The ECU 10 includes a CPU 60 as shown in FIG.
The CPU 10 has an output port 6 via a bus line 62.
8 and the input port 70 are connected. The CP sensor 14 is connected to the input port 70.

The ECU 10 also includes a buffer circuit 72 and a drive circuit 74. As described above, the electromagnetic valve 12 constitutes an intake valve and an exhaust valve of a four-cylinder four-valve internal combustion engine. That is, each cylinder of the internal combustion engine has two electromagnetic valves 12 operating as intake valves.
And two electromagnetic valves 12 that operate as exhaust valves. In this embodiment, a total of eight sets of buffer circuits 72 and drive circuits 74 are provided corresponding to the pair of intake valves provided in the same cylinder and the pair of intake valves provided in the same cylinder, respectively. Is provided.
However, since the configuration and operation of each buffer circuit 72 and drive circuit 74 are the same, FIG. 3 shows two electromagnetic valves 1 provided in one cylinder and constituting, for example, an intake valve.
2, only the buffer circuit 72 and the drive circuit 74 corresponding to FIG.

The drive circuit 74 has a power supply terminal 76 and a ground terminal 78. The power supply terminal 76 and the ground terminal 78 are connected to a power supply voltage line and a ground voltage line of the ECU 10, respectively. Therefore, the power supply voltage V of the ECU 10 is supplied to the power supply terminal 76. The ECU 1
Another power source other than 0 may be newly provided. Drive circuit 74
Also has nine field effect transistors (FETs) that function as switching means, ie, # 1FET8
0, # 2FET82, # 3FET84, # 4FET8
6, # 5FET88, # 6FET90, # 7FET9
2, # 8FET94 and # 9FET96.

# 1FET80, # 4FET86, and #
7 are connected to the power terminal 76.
Has been continued. Source terminal of # 1FET80 and # 4FE
An intake valve is provided between the source terminal of T86 and the source terminal of T86.
One electromagnetic valve 12 (hereinafter referred to as # 1 electromagnetic valve 12)_-1When
Lower coil 54 (hereinafter referred to as # 1 lower coil 54). _-1
) Are connected. Also, the source of # 4FET86
An intake valve is connected between the source terminal and # 7FET92.
The other electromagnetic valve 12 (hereinafter referred to as # 2 electromagnetic valve 1)
2_-2) Upper coil 48 (hereinafter referred to as # 2 lower coil)
Le 48_-2) Are connected.

# 1FET80, # 4FET86, and #
The source terminals of 7FET92 are # 2FET8
2, connected to the drain terminals of # 5FET88 and # 8FET94. # 2 Source terminal of FET82 and #
Between the source terminals of 5FET88, the upper coil 48 of the # 1 solenoid valve 12 ₁ (hereinafter, # 1 the upper coil 4
8 _-1 ). Also, # 5FET88
Between the source terminals of the source terminal of # 8FET94 lower coil 54 of the second solenoid valve 12 ₂ (hereinafter, referred to as # 2 lower coil 54 _-2) is connected.

# 2FET82, # 5FET88, and #
The source terminals of 8FET94 are # 3FET8
4, # 6FET90 and # 9FET96 are connected to the drain terminals. Also, # 3FET84, # 6FE
The source terminals of T90 and # 9FET 96 are both connected to ground terminal 78. # 1FET80 ~ # 9F
The gate terminal of the ET 96 is connected to the buffer circuit 72 described above. The buffer circuit 72 is a CPU 6
# 1FET80- # 9FET according to command signal from 0
A high-level or low-level drive signal is supplied to each of the 96 gate terminals. # 1FET80 to # 9FET96 are
When a high-level signal is supplied from the buffer circuit 72 to each gate terminal, the gate circuit is turned on. Also, # 1F
The ET80 to # 9FET96 are turned off by supplying a low-level signal from the buffer circuit 72 to each gate terminal.

Each of # 1FET80 to # 9FET96 includes an internal diode therein, which allows a current to flow from the source terminal to the drain terminal. Therefore, even in the off state, the # 1FET80 to # 9FET96 allow a current to flow from the source terminal side to the gate terminal side (that is, upward in FIG. 3).

In the electromagnetic valve driving apparatus of this embodiment, the two intake valves of each cylinder are opened and closed together at basically the same timing. However, when the internal combustion engine is operated at a low load and a low rotation speed, one intake valve is kept closed and only the other intake valve is opened and closed from the viewpoint of improving fuel efficiency. Similarly, the exhaust valves are basically opened and closed together at the same timing. May be opened and closed.

Hereinafter, first, the # 1 electromagnetic valve _12-1 and the # 2 electromagnetic valve _12-2 constituting the intake valves in the same cylinder will be described.
If There are opened and closed synchronously, FIG. 2 (a) and (b) of the indicating waveform exciting current # 1 solenoid valve 12 ₁ and # 2 electromagnetic valve 12 _-2 ECU 10 that are realized to supply the The operation state will be described. 4 to 7, # 1 upper coil 48 _-1 and # 2 the upper coil 48 _-2 E which is realized in order to supply an exciting current of the current pattern shown in FIG. 2 (a)
3 shows three operation states of the CU 10. It should be noted that in FIGS.
ET is marked with a circle.

The state shown in FIG. 4 corresponds to # 1F of the driving circuit 74.
ET80, # 2FET82, # 4FET86, # 6FE
This is realized by turning on T90, # 8FET94, and # 9FET96 and turning off the other FETs. In this state, # 1FET8
0, # 2 FET 82, # 1 upper coil 48 _-1 , and
The circuit reaching the ground terminal 78 via the # 6 FET 90 is conducted. Therefore, in # 1 upper coil 48 _-1 #
Direction from 2FET82 side toward # 6FET90 side (rightward in FIG. 4; hereinafter, this orientation is referred to as positive direction of the # 1 upper coil 48 _-1) exciting current is supplied. Hereinafter, a state in which the excitation current in the positive direction is supplied to the coil is referred to as a power supply state of the coil. Further, in the state shown in FIG. 4, the # 4FET86 power supply terminal 76, # 2 the upper coil 48 _-2, # 8FET94, and circuits leading to the ground terminal 78 via the # 9FET96 it is conductive. Therefore, the # 2 the upper coil 48 _-2 directed from # 4FET86 side to # 8FET94 side direction (rightward in FIG. 4;
Hereinafter, the excitation current of this orientation is referred to as positive direction of the # 2 the upper coil 48 _-2) is supplied. That is, even a power supply state for # 2 the upper coil 48 _-2. The size of the current that circulates in the coil are matched to the maximum exciting current I _MAX described above in the power supply state.

[0075] Incidentally, in the state shown in FIG. 4, the both ends thereof # 1 lower coils 54 _-1, which is turned on # 1FE
Since that will be shorted by T80 and # 4FET86, the excitation current that circulates in the # 1 lower coil 54 _-1 is substantially zero. Similarly, both ends of the # 2 lower coil 54 _-2 are turned on.
Since the 0 and # 9 FET 96 cause a short circuit, the exciting current flowing through is substantially zero.

As described above, in the state shown in FIG.
Maximum supplied to # 1 the upper coil 48 _-1 exciting current I
_MAX is # 1FET80, # 2FET82, and # 6FE
The maximum excitation current I _MAX flowing through T90 and supplied to the # 2 upper coil 48 _-2 is # 4FET86, # 8FET9
4 and # 9FET96. That is, since the maximum exciting current I _MAX supplied to # 1 upper coil 48 _-1 and # 2 the upper coil 48 _-2 never flows through the same FET, it is possible to suppress heat generation in each FET.

The state shown in FIG. 5 corresponds to # 1F of the driving circuit 74.
This is realized by turning on the ET 80 and the # 2 FET 82 and turning off the other FETs. In this state, the # 1FET80, # 2FET82, first upper coil 48 _-1, the internal diode of # 5FET88,
The closed circuit returning to the # 1 FET 80 via the second upper coil 48 _-2 and the internal diode of the # 7 FET 92 is conducted. The direction of the forward current of the # 1 upper coil 48 _-1 and # 2 the upper coil 48 _-2 described above, coincides with the direction of the closed circuit. Therefore, by switching from the power supply state shown in FIG. 4 to the state shown in FIG.
Without supplying a current to the drive circuit 74 from the # 1 upper coil 48 _-1 and # 2 the upper coil 48 _-2, the positive direction of the current due to the counter electromotive force, i.e., can be distributed flywheel current. Hereinafter, the state where the flywheel current flows through the coil is referred to as the flywheel state of the coil. The magnitude of the current flowing through the coil in the flywheel state gradually decreases due to the circuit resistance.

The state shown in FIG. 6 is realized by turning on # 4FET 86 and # 6FET 90 and turning off the other FETs. In this state, # 6FE
T90, # 3 internal diode 84 of FET84, and #
Closed circuit is conducted back to 1 the upper coil 48 _-1 through the # 6FET90. In the state shown in FIG. 6, # 4
FET 86, # 2 upper coil 48 _-2 , and # 7 FET
The closed circuit that returns to # 4FET 86 via the internal diode 92 is conducted. # 1 upper coil 48 _-1 and #
The direction of the forward current of 2 upper coil 48 _-2 coincides with the direction of the closed circuit. Accordingly, in the state shown in FIG. 6, as in the state shown in FIG.
_28-1 and # 2 the upper coil 48 _-2 both become flywheel state.

The state shown in FIG. 7 is for # 3FET84, # 5
This is realized by turning on the FET 88 and the # 7 FET 92 and turning off the other FETs. In this state, the # 7 FET 92, the # 2 upper coil 48 _-2 , the # 5 FET 88, the # 1 upper coil 48
_-1 and the circuit that reaches the ground terminal 78 via the # 3 FET 84 is conducted. In this case, the # 1 upper coil 48 _-1
And # in greater state than the power supply voltage V sum of the counter electromotive force is supplied to the power supply terminal 76 has occurred in the 2 upper coil 48 _-2 positive for circulating the # 1 upper coil 48 _-1 and # 2 the upper coil 48 _-2 When the current in the direction is recovered as regenerative energy on the power supply side, the current rapidly decreases toward zero. On the other hand, the sum of the back electromotive force is the power supply voltage V
The smaller state than, # 2 upper coil 48 _-2 and #
1 to the upper coil 48 _-1, respectively, # 7FET92
An excitation current is supplied from the # 5FET 88 side to the # 5FET 88 side (leftward in FIG. 7) and from the # 5FET88 side to the # 3FET84 side (leftward in FIG. 7). # 1 upper coil 48 _-1 and # these exciting current supplied to the 2 upper coil 48 _-2, the reverse direction to the positive direction current. That is, in the state shown in FIG.
# Can be supplied to reverse demagnetizing current I _R 1 upper coil 48 _-1 and # 2 the upper coil 48 _-2. Less than,
A state in which a current caused by the back electromotive force of the coil is recovered to the power supply side as regenerative energy, or a state in which an exciting current is supplied in a reverse direction is referred to as a regenerative / reverse current state of the coil.

[0080] As described above, # 1 upper coil 48 _-1 and # 2 the upper coil 48 _-2, is a power supply state is in the state shown in FIG. 4, in the state shown in FIG. 5 or FIG. 6 is a flywheel state, FIG. In the state shown in FIG. 7, a regenerative / reverse current state is set. Accordingly, the ECU 10 realizes the state shown in FIG. 4 during the period A shown in FIG.
1 upper coil 48 _-1 and # 2 the upper coil can supply a maximum exciting current I _MAX 48 _-2 Further, FIG. 2
In a period B shown in (a), by implementing appropriately switched state shown in FIGS. 4 to 7, # 1 upper coil 48 _-1 and # 2 the upper coil 48 _-2 exciting current supplied from the I _MAX in I _H Can be reduced. Further, in the period C shown in FIG. 2 (a), by realizing appropriately switching the state shown in state and FIG. 5 or 6 shown in FIG. 4, the # 1 upper coil 48 _-1 and # 2 the upper coil 48 _-2 The supplied exciting current can be held at the holding current I _H , and in the period D shown in FIG.
By implementing the state shown in FIG. 7, it is possible to supply a degaussing current I _R with respect to # 1 upper coil 48 _-1 and # 2 the upper coil 48 _-2.

As described above, in this embodiment, the ECU
10, FIG. 4 to FIG. By implementing appropriately switching the state shown in 7, # 1 upper coil 48 _-1 and # 2 the upper coil 48 and exciting current supplied to _-2 FIG. 2 (a), the
Control can be performed according to the waveform shown in FIG. The case of controlling the excitation current supplied to the upper coil 48 has been described above. By doing so, the states corresponding to FIGS. 4 to 7 can be formed for the lower coil 54.

That is, # 2 corresponding to the state shown in FIG.
FET82, # 3FET84, # 4FET86, # 6F
ET90, # 7FET92, and # 8FET94 By the ON state, it is possible to the # 1 lower coil 54 _-1 and # 2 lower coil 54 _-2 and power supply state. Incidentally, the positive direction of the # 1 lower coils 54 _-1 # 4FE
The direction from the T86 side to the # 2FET 82 side (leftward in the figure), and the positive direction of the # 2 lower coil 54 _-2 is the direction from the # 8FET94 side to the # 6FET90 side (leftward in the figure).

The # 1 lower coil 54 is turned on by turning on the # 7 FET 92 and # 8 FET 94 corresponding to FIG. 5, or by turning on the # 4 FET 86 and # 6 FET similarly to the state shown in FIG. _-1 and the # 2 lower coil 54 _-2 can be in a flywheel state. Further, the # 1 FET corresponding to the state shown in FIG.
80, # 5FET88, and by the ON state # 9FET96, can be a # 1 lower coil 54 _-1 and # 2 lower coil 54 _-2 and regenerative-reverse current state.

Next, one intake valve (for example, # 2 electromagnetic valve 12 _-2 ) in the same cylinder is kept closed, and only the other intake valve (for example, # 1 electromagnetic valve 12 _-1 ) is opened and closed. The operation of the ECU 10 in the case of performing the operation will be described.
8 holds the # 2 electromagnetic valve 12 _-2 closed state, #
1 to open and close driving the electromagnetic valve 12 _-1, # 1 the upper coil 48 _-1, # 1 lower coils 54 _-1, # 2 the upper coil 4
_8-2, and shows the current waveform of the exciting current supplied to each # 2 lower coil 54 _-2. FIG. 8 (a), the as shown in (b), # 1 upper coil 48 _-1 and # 1 lower coil 54
_-1 is supplied with an exciting current having a current waveform similar to that shown in FIGS. 2A and 2B, so that the # 1 electromagnetic valve 12 _-1 is supplied.
Is driven to open and close. On the other hand, FIG. 8 (c), the maintained as shown in (d), # 2 the upper coil 48 _-2 magnitude equal to the excitation current holding current I _H supplied to is supplied to the # 2 lower coil 54 _-2 By setting the excitation current to zero, #
2 solenoid valve _12-2 is maintained in a closed state. However,
Just before the # 1 the upper coil 48 _-1 or # 1 lower coils 54 _-1 demagnetizing current I _R is supplied, # 2 the upper coil 48
_The exciting current supplied to _-2 is temporarily increased. The reason will be described later.

The current waveform shown in FIG. 8 can be realized by appropriately switching the states shown in FIGS. 9 to 16 in addition to the states shown in FIG. 4, FIG. 5, or FIG.
First, # 1 the upper coil 48 _-1 when supplying exciting current (period A shown in FIG. 8 (a), B, C , D) will be described. The current waveforms in the periods A, B, C, and D shown in FIG. 8A correspond to the states shown in FIGS.
This is realized by appropriately switching the state shown in FIG.

The state shown in FIG. 9 is for # 1FET80, # 2
This is realized by turning on the FET 82, the # 4 FET 86, and the # 6 FET 90 and turning off the other FETs. In this state, # 1FET
The circuit which reaches the ground terminal 78 via the # 80, # 2 FET 82, # 1 upper coil 48 _-1 and # 6 FET 90 is conducted. Therefore, # 1 the upper coil 48 _-1 positive direction of maximum excitation current I _MAX from the power supply terminal 76 to is supplied. That is, # 1 the upper coil 48 _-1 is a power supply state. In the state shown in FIG.
6, the closed circuit returning to the # 4 FET 86 via the # 2 upper coil 48 _-2 and the internal diode of the # 7 FET 92 is conducted. Therefore, it is possible to distribute the flywheel current to # 2 the upper coil 48 _-2. That is,
# 2 upper coil 48 _-2 is the flywheel state.

The state shown in FIG.
6FET90, # 8FET94 and # 9FET96
By turning on and turning off other FETs
Is achieved. In this state, # 6FET90, # 3FE
Internal diode of T84 and # 1 upper coil 48_-1
, The closed circuit returning to # 3FET 90 is conducted.
Therefore, the # 1 upper coil 48_-1Is flywheel shaped
State. In the state shown in FIG.
6 to # 4 FET 86, # 2 upper coil 48 _-2, # 8
Ground terminal 7 via FET94 and # 9FET96
The circuit leading to 8 is conducted. For this reason, # 2 upper carp
Le 48_-2Is in a power supply state.

The state shown in FIG.
This is realized by turning on the 4FET 86 and # 5FET 88. In this state, the # 4 FET 86, # 5 FET 88, # 1 upper coil 4
The circuit reaching the ground terminal 78 via the 8 _-1 and # 3 FETs 84 is conducted. Therefore, the # 1 upper coil is in a regenerative / reverse current state. In the state shown in FIG. 11, the # 4 FET 86, the # 2 upper coil 48 _-2 ,
# 4FET8 via the internal diode of 7FET92
The closed circuit returning to 6 is conducted. Thus, # 2 the upper coil 48 _-2 is the flywheel state.

[0089] As described above, in the state shown in FIG. 4, both the # 1 upper coil 48 _-1 and # 2 the upper coil 48 _-2 is a power supply state. On the other hand, in the state shown in FIG.
Whereas 1 upper coil 48 _-1 is the power supply state, # 2 the upper coil 48 _-2 is the flywheel state. Accordingly, the period A shown in FIG. 8 (a) by switching the state shown in FIG. 4, a state shown in FIG. 9, so that the current supplied to the # 2 the upper coil 48 _-2 matching the holding current I _H Can be realized.

FIG. 4, FIG. 5 or FIG. 6, FIG.
In the state shown in FIG. 10, the # 1 upper coil 48_-1And # 2
Upper coil 48_-2Power supply status and
All combinations of wheel states are realized. Change
In the state shown in FIG. 11, the # 2 upper coil 48_-2To
Flywheel is distributed and # 1 upper coil 48
_-1Is supplied with a reverse current. Therefore, # 1 upper carp
Le 48_-1The excitation current supplied to the
I_H, While the # 2 upper coil 48_-2To
The supplied excitation current is the holding current I_HTo be kept in
By switching the above five states, FIG.
The current waveform in the period B shown can be realized.

In the period C shown in FIG.
Upper coil 48_-1And # 2 upper coil 48_-2Supply of
The exciting current is the holding current I_HIs held. Therefore,
Switching between the state shown in FIG. 4 and the state shown in FIG. 5
Realizing the current waveform in the period C shown in FIG.
Can be. Further, in a period D shown in FIG.
Top coil 48_-1The reverse current I _RIs supplied. Follow
8 by forming the state shown in FIG.
The current waveform in the period D shown in FIG.
You. However, in the state shown in FIG. 11, the # 2 upper coil
48_-2Is in a flywheel state,
The magnitude of the stream decreases over time. So, the real
In the embodiment, such a period D in the period D shown in FIG.
In anticipation of a decrease in the exciting current, immediately before shifting to period D (
That is, # 2 upper coil 48 at the end of period C)_-2To serve
As the magnitude of the exciting current to be supplied is increased by a predetermined amount
I have. Note that the # 2 upper cover during the period C shown in FIG.
Il 48_-2The increase in the exciting current supplied to the
In the state switching, for example, the state shown in FIG.
2 upper coil 48_-2Is in the power supply state)
Change the time ratio to the state shown in FIG. 5 or FIG. 6 (# 2 upper coil
Le 48 _-2Is the flywheel state)
Can be realized by increasing against the rate
You.

Next, the case of supplying an exciting current to # 1 the lower coil 54 _-1 (period shown in FIG. 8 (b) A, B, C, D)
Will be described. Periods A, B, C shown in FIG.
The current waveform of D is realized by appropriately switching the states shown in FIGS. The state shown in FIG.
2FET82, # 3FET84, # 4FET86, # 8
This is realized by turning on the FET 94 and the # 9 FET 96 and turning off the other FETs. In this state, # 4FET86 from the power supply terminal 76, # 1 lower coils 54 _-1, # 2FET82, and # 3FET84 with circuits leading to the ground terminal 78 via is conducting, # from the power supply terminal 76 4FET86, # 2 upper coil 48
_-2 , the circuit reaching the ground terminal 78 via the # 8 FET 94 and the # 9 FET 96 is conducted. Therefore, # 1 lower coils 54 ₁ and # 2 the upper coil 48 _-2 are both a power supply state.

The state shown in FIG.
This is realized by turning on the 3FET 84 and # 4FET 86 and turning off the other FETs. In this state, the # 4FET86 power supply terminal 76, # 1 lower coils 54 _-1, # 2FET82, and # 3FET84 circuit leading to the ground terminal 78 via the conduction. Therefore, # 1 lower coils 54 _-1 is a power supply state. In the state shown in FIG. 13, the closed circuit that returns to the # 4FET 86 via the # 4FET 86, the # 2 upper coil 48 _-2 , and the internal diode of the # 7FET 92 is conducted.
Thus, # 2 the upper coil 48 _-2 is the flywheel state.

The state shown in FIG.
This is realized by turning on the 8 FET 94 and # 9 FET 96 and turning off the other FETs. In this state, # 4FET86, via the internal diode of the # 1 lower coils 54 _-1, and # 1FET80 # 4FE
The closed circuit returning to T86 is conducted. Therefore, # 1 lower coils 54 _-1 is the flywheel state. Further, in the state shown in FIG.
6, # 2 upper coil 48 _-2 , # 8 FET94, and #
The circuit reaching the ground terminal 78 via the 9FET 96 is conducted. Therefore # 2 the upper coil 48 _-2 is a power supply state.

The state shown in FIG. 15 is realized by turning on only the # 4 FET 86 and turning off the other FETs. In this state, the closed circuit returning to the # 4FET 86 via the # 4FET 86, the # 1 lower coil 54 _-1 and the internal diode of the # 1FET 80 is conducted, and the # 4FET 86, the # 2 upper coil 48 _-2 , and the # 7FET 92 # 4FET via internal diode
The closed circuit returning to 86 is conducted. Therefore, # 1 lower coils 54 ₁ and # 2 the upper coil 48 _-2 are both flywheel state.

The state shown in FIG.
This is realized by turning on the 5FET88, # 6FET90, # 8FET94, and # 9FET96 and turning off the other FETs. In this state, # 1FET80 from the power supply terminal 76, # 1 lower coils 54 _-1, # 5
Ground terminal 7 via FET 88 and # 6 FET 90
The circuit leading to 8 is conducted. Therefore, # 1 the upper coil 48 _-1 is the regenerative-reverse current state. In the state shown in FIG. 16, # 6FET90, # 5FET88, # 2FET
Upper coil 48 _-2 , # 8FET94 and # 9FET
The closed circuit returning to # 6FET 90 via 96 is conducted. Thus, # 2 the upper coil 48 _-2 is the flywheel state.

As described above, in the state shown in FIG.
Lower coils 54 ₁ and # 2 the upper coil 48 _-2 are both a power supply state, whereas, in the state shown in FIG. 13, # 1
Whereas the lower coil 54 _-1 is a power supply state,
# 2 upper coil 48 _-2 is the flywheel state. Thus, Figure by switching to the state shown in state and 13 shown in FIG. 12, the exciting current supplied to the # 2 the upper coil 48 _-2 is maintained in the holding current I _H 8
The current waveform in the period A shown in (b) can be realized.

Further, FIG. 12, FIG. 13, FIG.
According to the state shown in 5, # 1 lower coils 54 ₁ and # 2
Upper coil 48 _-2 with by the, all combinations achieved monkey power supply state and the flywheel state. Further, in the state shown in FIG. 16, # 2 the upper coil 48 _-2 # 1 lower coil 54 _-1 while being the flywheel state is regenerative-reverse current state. Therefore, the # 1 lower coil 54
_-1 decreases in the desired gradient toward the holding current I _H , while the excitation current supplied to the # 2 upper coil 48 _-2 is held at the holding current I _H. By switching the five states, a current waveform in a period B shown in FIG. 8B can be realized.

In a period C shown in FIG.
Lower coils 54 ₁ and # exciting current supplied to the 2 upper coil 48 _-2 both held by the holding current I _H. Therefore, by switching between the state shown in FIG. 12 and the state shown in FIG. 15, the current waveform in the period C shown in FIG. 8A can be realized. Furthermore, in the period D shown in FIG. 8 (b), the reverse current I _R is supplied to the # 1 lower coil 54 _-1. Therefore, by realizing the state shown in FIG.
A current waveform in a period D shown in FIG. 8B can be obtained. However, in the state shown in FIG. 16, since the # 2 the upper coil 48 _-2 is the flywheel state, the magnitude of the exciting current flowing in the # 2 upper coil 48 _-2 decreases with time. Accordingly, in this embodiment, in anticipation of reduction of such excitation current, immediately before entering the period D (i.e., the end of the period C) increased by a predetermined amount the magnitude of # 2 the upper coil 48 _-2 supplying exciting current to I am going to let it. Incidentally, an increase of # 2 the upper coil 48 _-2 supplying exciting current in the period C shown in FIG. 8 (b), FIG. 1 described above
In the switching of the state shown in FIGS.
To show a state (state in which the # 2 the upper coil 48 _-2 is the flywheel state) the time ratio of (# 2 the upper coil 48 _{state -2} is a power supply state), the state shown in FIG. 15
Can be realized by increasing the time ratio.

[0100] above, # 2 holds the electromagnetic valve 12 _-2 closed state, # 1 has been described for opening and closing the electromagnetic valve 12 _-1, hold the # 1 solenoid valve 12 _-1 in the closed state Alternatively, the # 2 electromagnetic valve _12-2 can be driven to open and close. That is, in each state shown in FIG. 9 to FIG.
By turning T on, states corresponding to the states shown in FIGS. 9 to 16 can be realized.

For example, with respect to # 1FET80, # 2FET82, # 4FET86, and # 6FET90 which are turned on in the state shown in FIG. 9, # 9FET96, # 8FET94, # 6FET90,
By turning on the # 4 FET 86, the # 1
The upper coil 48 _-1 and flywheel state, the # 2 upper coil 48 _-2 can be a power supply state.
Similarly, corresponding to the state shown in FIG.
0, # 4FET86, # 2FET82, and # 1FET
Is turned on, so that the # 1 upper coil 48 _-1
And the # 2 upper coil 48 _-2
Is a flywheel state; # 7FET92, # 6FET90, and # 5FET corresponding to the state shown in FIG.
By turning 88 on, the # 1 upper coil 4
8 _-1 with a flywheel state, # 2 upper coil 48 _-2 and regenerative-reverse current state; corresponds to the state shown in FIG. 12, # 8FET94, # 7FET92, # 6F
ET90, # 2FET82, and # by the ON state 1FET80, # 1 upper coil 48 _-1 and #
2 lower coil 54 together with the power supply state _-2; corresponds to the state shown in FIG. 13, # 8FET94, # 7FET9
2, and by turning on # 6 FET 90,
# 1 the upper coil 48 _-1 with a flywheel state, the # 2 lower coil 54 _-2 a power supply state; Figure 1
# 6FET90, # 2FET corresponding to the state shown in FIG.
82, and by a # 1FET80 an ON state, while the # 1 upper coil 48 _-1 and power supply state, the # 2 lower coil 54 _-2 flywheel state;
Corresponds to the state shown in FIG. 15, by only # 6FET90 turned on, both the # 1 upper coil 48 _-1 and # 2 lower coil 54 _-2 flywheel state;
According to the state shown in FIG. 16, # 9FET96, # 5F
ET88, # 4FET86, # 2FET82, and # 1
By the FET80 the ON state, the # 1 upper coil 48 _-1 with a flywheel state, can be a # 2 lower coil 54 _-2 and regenerative-reverse current state.

Then, the above-described # 2 electromagnetic valve 12 _-2
The as in the case of opening and closing the # 1 solenoid valve 12 _-1 while maintaining the closed state, by switching appropriately the respective states corresponding to the state of FIGS. 9 16, the # 1 upper coil 48 _-1 while maintaining the exciting current supplied to the holding current I _H (i.e., while retaining the # 1 solenoid valve 12 _-1 in the closed state), Fig. 8 to # 2 upper coil 48 _-2 and # 2 lower coil 54 ₂ ( The # 2 electromagnetic valve _12-2 can be opened and closed by supplying an exciting current having the same waveform as in FIGS.

[0103] As described above, according to this embodiment, # 1 the upper coil 48 _-1, # 1 lower coils 54 _-1, # 2 the upper coil 48 _-2, and the # 2 lower coil 54 _-2, respectively forward and backward directions of the current Can be supplied, thereby providing a
Alternatively, the exciting current supplied to each coil can be controlled according to the current pattern shown in FIG. Therefore, according to the control apparatus for the electromagnetic valve of the present embodiment, the armature 4
When the armature 4 contacts the first electromagnet 46 or the second electromagnet 52, the armature 44 and the first electromagnet 46 or the second electromagnet 52
Can be quickly eliminated. Therefore, it is possible to suppress the collision noise caused by the opening and closing operation of the electromagnetic valve 12, to improve the durability of the electromagnetic valve 12, and to realize the high responsiveness of the electromagnetic valve 12.

In the present embodiment, the above performance is realized by configuring one drive circuit 74 for a total of four electromagnetic coils provided in two electromagnetic valves constituting an intake valve or an exhaust valve of the same cylinder. Have been. That is, the exciting current supplied to these four electromagnetic coils is changed to nine switching means, that is, # 1FETs 80 to # 9.
It can be controlled by the FET 96. On the other hand, when one electromagnetic coil is controlled by the H-type bridge circuit as in the above-described conventional technique, 16 switching means are required for four electromagnetic coils. Therefore, when the conventional configuration is applied to a four-cylinder four-valve internal combustion engine, a total of 128 switching means are required, whereas according to the present embodiment, 72 switching means are sufficient. It will be.

As described above, according to the present embodiment, the necessary switching means is provided by providing the FETs 80 to 96, which are switching means, collectively for the electromagnetic valve 12 which is opened and closed in synchronization with each other. Can be realized while significantly reducing the number of devices compared to the related art. Next, a second embodiment of the present invention will be described. The electromagnetic valve drive device of the present embodiment is the same as the electromagnetic valve control device of the first embodiment, except that the ECU 1
This is realized by using the ECU 110 instead of 0.

FIG. 17 is a circuit diagram showing the internal configuration of the ECU 110 of this embodiment. In FIG. 17, FIG.
The same reference numerals are given to the same components as described above, and the description thereof will be omitted or simplified. As shown in FIG.
10 has a control circuit 174. Control circuit 174
Corresponds to # 5FET8 in the drive circuit 74 of the above embodiment.
This is realized by using a diode 188 instead of 8. The diode 188 is arranged to allow a current to flow from the ground terminal 78 toward the power supply terminal 76.

In this embodiment, basically, the same FET as the first embodiment, which is turned on in each of the states shown in FIGS. 4 to 7 and FIGS. 9 to 16, is turned on. By doing so, states similar to these states can be realized. Of these, in the states shown in FIGS. 4, 5, 6, 9, 10, 10, 12, 13, 14, and 15, the # 5FET 88 is off, and the same as the internal diode thereof. The function of the diode 188 of this embodiment is
Realizes the same state as each of these states. On the other hand, in the state shown in FIG. 7, FIG. 11, and FIG.
In the present embodiment, the diode 188 is provided in place of the # 5 FET 88, whereas the FET 88 is in the ON state. Thus, the same state as the state shown in FIGS. I can't. Hereinafter, FIG.
Referring to FIGS. 8 to 20, FIGS.
1 and the state corresponding to FIG. 16 will be described.

FIG. 18 corresponds to FIG. 7 in this embodiment.
Indicates a corresponding state. The state shown in FIG.
Is turned off. In this state
From the ground terminal 78 to the internal diode of # 3FET84.
C, # 1 upper coil 48_-1, Diode 188, # 2
Upper coil 48_-2, And the internal diode of # 7FET92
The circuit reaching the power supply terminal 76 via the node is conducted.
Therefore, the # 1 upper coil 48_-1And # 2 upper coil
48_-2The sum of the back electromotive forces of the two is greater than the power supply voltage V
Flows through these coils similarly to the state shown in FIG.
The current can be recovered to the power supply as regenerative energy.
Wear. However, unlike the state shown in FIG.
# 2 upper coil 48_-2# 1 from the side
Top coil 48 _-1The flow of current to the side is blocked.
Therefore, # 3FET84 and # 7FET92 are turned on.
Even if it does, the # 1 upper coil 48_-1And # 2
Pacoil 48_-2The demagnetizing current I in the opposite direction_RSupplying
Can not. For this reason, in the state shown in FIG.
ET84 and # 7FET92 are off. Was
However, # 3FET84 and # 7FET92 are turned on.
There is no change in operation. Note that the following
Current can be recovered as regenerative energy.
The state where the current cannot be supplied
Called the regenerative state.

FIG. 19 shows a state corresponding to FIG. 11 in this embodiment. The state shown in FIG.
This is realized by turning on 86 and turning off other FETs. In this state, similarly to the state shown in FIG. 11, the # 4FE 86 passes through the # 4FET 86, the # 2 upper coil 48 _-2 , and the internal diode of the # 7FET 92.
The closed circuit returning to T86 is conducted. Thus, # 2 the upper coil 48 _-2 is the flywheel state. Also,
In the state shown in FIG. 19, # 3FET8
4. The circuit reaching the power supply terminal 76 via the # 1 upper coil 48 _-1 , the diode 188 and the # 4FET 86 is conducted. Therefore, the counter electromotive force of the # 1 upper coil 48 _-1 if the power supply voltage greater than, as in the state shown in FIG. 11, be recovered as regenerative energy current that circulates in the # 1 the upper coil 48 _-1 to the power supply side be able to. However, unlike the state shown in FIG.
8, the # 1 upper coil 48 _-1 from the # 4 FET 86 side.
# 3FE because the flow of current toward the side is blocked.
Even if T84 is turned on, the # 1 upper coil 4
No reverse current can be supplied to 8 _-1 . That is, in the state shown in FIG. 19, regardless of the on and off of the # 3FET84, # 1 the upper coil 48 _-1 is the regeneration state.

FIG. 20 shows a state corresponding to FIG. 16 in this embodiment. The state shown in FIG.
This is realized by turning on the 94 and # 9 FET 96 and turning off the other FETs. In this state,
As in the state shown in FIG. 16, # 8FET94, # 9FE
T96, # 8F via the internal diode, the diode 188, and # 2 the upper coil 48 _-2 # 6FET90
The closed circuit returning to ET94 is conducted. Thus, # 2 the upper coil 48 _-2 is the flywheel state. In the state shown in FIG. 20, the ground terminal 78 is connected to the # 6FE.
T90 internal diode, the diode 188, # 1 lower coils 54 _-1, and the circuit leading to the power supply terminal 76 via the internal diode of # 1FET80 is conducted. Thus, if # 1 lower coil 54 back electromotive force of the _-1 power supply voltage greater than V, similar to the state shown in FIG. 16, recovered as regenerative energy current that circulates in the # 1 lower coil 54 _-1 to the power supply side can do. However, unlike the state shown in FIG. 16, since the distribution of the current flowing through diode 188 from # 1 lower coil 54 _-1 side to # 6FET90 side is blocked, # 1FET80 and # 6FET
Even if 90 is turned on, the # 1 upper coil 48
Reverse current to _-1 and # 2 the upper coil 48 _-2 it can not be supplied. That is, in the state shown in FIG.
Regardless of the ON / OFF state of the 1FET 80 and the # 6FET 90, the # 1 lower coil is in a regenerative state.

As described above, in the present embodiment, the electromagnetic coils of the # 1 upper coil 48 _-1 , the # 1 lower coil 54 _-1 , the # 2 upper coil 48 _-2 , and the # 2 lower coil 54 _-2 have opposite directions. can not be supplied in the degaussing current I _R. However, in the states shown in FIGS. 18 to 20, voltages in opposite directions are applied to these electromagnetic coils,
The current flowing through the electromagnetic coil can be recovered to the power supply as regenerative energy. Therefore, by realizing the states shown in FIGS. 18 to 20, the current flowing through each electromagnetic coil can be rapidly reduced.

FIG. 21 shows # 1 electromagnetic valves 12 _-1 and # 2
When synchronously driving both the electromagnetic valves _12-2 shows a current waveform of the supplied exciting current to the upper coil 48 and lower coil 54. Periods A, B, and C shown in FIG.
Is similar to the case of the first embodiment,
It can be realized by appropriately switching the state corresponding to FIG. 4, FIG. 5 or FIG. 6, and the state shown in FIG. The current waveform shown in FIG. 21B corresponds to the FE that is turned on in the state corresponding to FIG. 4, and FIG. 5 or FIG.
A state in which the FET located vertically symmetrically with T is turned on,
In addition, it can be realized by appropriately switching the state shown in FIG. 18 (in the state shown in FIG. 18, since all the FETs are in the off state, the upper coil 48 and the lower coil 54 are commonly used).

[0113] However, as described above, in this embodiment, can not supply the reverse current to the electromagnetic coil, as shown in FIG. 21 (a), the excitation current supplied to the upper coil 48 to a predetermined value I _H The exciting current does not become negative in the period D after the lapse of the held period C. However, by realizing the state shown in FIG. 18 in this period D, the current flowing through the upper coil 48 is recovered as regenerative energy on the power supply side, whereby the exciting current can be quickly converged to zero. Note that FIG.
In the period D for the lower coil 54 shown in FIG. 1B, the state shown in FIG.
4 can be quickly converged to zero.

FIG. 22 shows the state of the # 2 electromagnetic valve 12._-2The valve closed
State, the # 1 electromagnetic valve 12_-1A place to open and close only
In this case, the # 1 upper coil 48_-1, # 1 lower coil 5
4_-1, And # 2 upper coil 48_-2Excitation current supplied to
3 shows a current waveform of the current. Such a current waveform corresponds to the first embodiment.
4, FIG. 5 or FIG. 6, FIG. 9, FIG.
0, states corresponding to FIGS. 12 to 15, and FIGS.
19 corresponding to FIG. 11 and FIG. 20 corresponding to FIG.
It can be realized by switching each state appropriately
You. Also in the current waveform shown in FIG.
In the period D after this, the state shown in FIG.
By realizing the state, the # 1 upper coil 48_-1as well as
# 1 lower coil 54_-1To zero the current flowing through
It can be converged. In this case, FIGS. 19 and 20
In the state shown in FIG._-2Is Fly Hoi
# 2 upper coil during period D
Le 48 _-2, The exciting current flowing through is reduced. So, heel
Immediately before shifting to period D, # 2
Pacoil 48_-2The exciting current supplied to the_HThan
It has been increased by a predetermined amount.

The # 2 electromagnetic valve is switched by switching between the FETs that were turned on in each of the above-mentioned states used to realize the current waveform shown in FIG. 12 _-2 held in the closed state, can be opened and closed driving only # 1 solenoid valve 12 _1. As described above, according to the present embodiment, the current shown in FIGS. 18 to 20 is realized after the supply of the exciting current to the electromagnetic coil is completed, so that the current flowing through the electromagnetic coil quickly converges to zero. Can be. Therefore, the first
As compared with the embodiment, although the effect is inferior to the fact that the reverse current is not supplied to the electromagnetic coil, the electromagnetic attraction force acting between the plunger 44 and the first electromagnet 46 or the second electromagnet 52 after the plunger 44 contacts the first electromagnet 46 or the second electromagnet 52. Can be quickly eliminated.

The control circuit 174 of this embodiment is realized by using a relatively inexpensive diode 188 instead of the # 5FET 88 of the first embodiment. Therefore, in this embodiment, it is possible to realize a control device for an electromagnetic valve having the above-described performance while further reducing the cost of the device. In the above-described embodiment, the case where two intake valves and two exhaust valves are provided for each cylinder of the internal combustion engine has been described. However, the present invention is not limited to this. The present invention can also be applied to an internal combustion engine provided with one exhaust valve. In this case, by applying the above configuration only to the intake valve, the number of switching means for driving the intake valve can be reduced. In the first and second embodiments, # 1FETs 80 to # 9F
ET96 corresponds to the switching means described in the claims.

[0117]

As described above, according to the first aspect of the present invention, since it is not necessary to provide switching means for each electromagnet, the number of switching means can be reduced. According to the second aspect of the present invention, the number of switching means can be reduced even when the valve elements of each valve element group are not simultaneously opened and closed.

According to the third and fifth aspects of the present invention, nine switching means are used for four electromagnets for driving two valve bodies of each valve body group, and each electromagnet is moved in both forward and reverse directions. And the current flowing through each electromagnet can flow into the first power supply terminal. According to the fourth and sixth aspects of the present invention, eight switching means and one diode are used for four electromagnets for driving two valve elements of each valve element group, and each of the electromagnets is positively operated. In addition to supplying the exciting current in the directions, the exciting current flowing through each electromagnet can flow into the first power supply terminal.

According to the seventh aspect of the present invention, four electromagnets for driving two valve bodies of each valve body group are provided with 9 electromagnets.
Using one switching means, both or one of the first and second electromagnets of these two valve bodies can be in a power supply state or a regenerative / reverse current state. Therefore, according to the present invention, the power supply state and the regenerative / reverse current state are appropriately realized according to the operation of the valve body while reducing the number of switching means, so that the valve body is actuated after driving. The electromagnetic force generated can be quickly eliminated.

According to the eighth aspect of the present invention, four electromagnets for driving two valve elements of each valve element group are provided with 8 electromagnets.
By using one switching means and one diode, the first or second electromagnet of both or one of these two valve bodies can be brought into a power supply state or a regenerative state. Therefore, according to the present invention, while further reducing costs,
By appropriately realizing the power supply state and the regenerative state in accordance with the operation of the valve element, the electromagnetic force acting on the valve element can be quickly eliminated after driving the valve element.

According to the ninth aspect of the present invention, a state in which a flywheel current flows through the electromagnet can be realized. According to the tenth aspect, it is possible to control the current waveform of the exciting current supplied to the electromagnet while reducing the number of switching means. According to the eleventh aspect of the present invention, the electromagnetic force can be quickly eliminated after the valve body is driven by the electromagnet.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an electromagnetic valve driving device according to an embodiment of the present invention.

FIG. 2 is a diagram showing a current waveform of an exciting current supplied to an upper coil and a lower coil when two electromagnetic valves are driven to open and close together in the present embodiment, and an operation of the electromagnetic valve corresponding to the current waveform.

FIG. 3 shows an EC provided in the electromagnetic valve driving device according to the embodiment.
This is the internal configuration head of U.

FIG. 4 is a diagram illustrating an operation state of a drive circuit in which both a # 1 upper coil and a # 2 upper coil are in a power supply state;

FIG. 5 is a diagram illustrating an operation state of the drive circuit in which both the # 1 upper coil and the # 2 upper coil are in a flywheel state.

FIG. 6 is a diagram illustrating an operation state of the drive circuit in which both the # 1 upper coil and the # 2 upper coil are in a flywheel state.

FIG. 7 is a diagram showing an operation state of the drive circuit in which both the # 1 upper coil and the # 2 upper coil are in a regenerative / reverse current state.

FIG. 8 is a diagram showing a state in which the # 1 electromagnetic valve is opened and closed and the # 2 electromagnetic valve is kept closed in the present embodiment. FIG. 3 is a diagram showing a current waveform of an exciting current.

FIG. 9 shows a state in which the # 1 upper coil is in a power supply state,
FIG. 4 is a diagram illustrating an operation state of a drive circuit in which an upper coil is in a flywheel state.

FIG. 10 is a diagram illustrating an operation state of a drive circuit in which a # 1 upper coil is in a flywheel state and a # 2 upper coil is in a power supply state.

FIG. 11 is a diagram showing an operation state of the drive circuit in which the # 1 upper coil is in a regenerative / reverse current state and the # 2 upper coil is in a flywheel state.

FIG. 12 is a diagram illustrating an operation state of a drive circuit in which both a # 1 lower coil and a # 2 upper coil are in a power supply state.

FIG. 13 is a diagram showing a state in which the # 1 lower coil is supplied with power and
FIG. 4 is a diagram illustrating an operation state of a drive circuit in which an upper coil is in a flywheel state.

FIG. 14 is a diagram illustrating an operation state of a drive circuit in which a # 1 lower coil is in a flywheel state and a # 2 upper coil is in a power supply state.

FIG. 15 is a diagram illustrating an operation state of the drive circuit in which both the # 1 lower coil and the # 2 upper coil are in a flywheel state.

FIG. 16 shows that the # 1 lower coil is in a regenerative / reverse current state,
FIG. 9 is a diagram illustrating an operation state of the drive circuit in which the # 2 upper coil is in a flywheel state.

FIG. 17 is an internal configuration diagram of an ECU provided in the electromagnetic valve driving device according to the second embodiment of the present invention.

FIG. 18 is a diagram illustrating an operation state of the drive circuit in which both the # 1 upper coil and the # 2 upper coil are in a regenerative state.

FIG. 19 is a diagram illustrating an operation state of the drive circuit in which the # 1 upper coil is in a regenerative state and the # 2 upper coil is in a flywheel state.

FIG. 20 is a diagram showing an operation state of the drive circuit in which the # 1 lower coil is in a regenerative state and the # 2 upper coil is in a flywheel state.

FIG. 21 is a diagram showing a current waveform of an exciting current supplied to an upper coil and a lower coil when two electromagnetic valves are both opened and closed in this embodiment.

FIG. 22 illustrates a case where the # 1 electromagnetic valve is driven to open and close and the # 2 electromagnetic valve is kept closed in the present embodiment.
It is a figure which shows the current waveform of the exciting current supplied to an upper coil, a # 1 lower coil, a # 2 upper coil, and a # 2 lower coil.

[Explanation of symbols]

 10, 110 ECU 16 Valve element 48 Upper coil 54 Lower coil 74, 174 drive circuit 80 # 1FET 82 # 2FET 84 # 3FET 86 # 4FET 88 # 5FET 90 # 6FET 92 # 7FET 94 # 8FET 96 # 9FET188 Diode

Claims (11)

[Claims] 1. An electromagnetic valve driving device for driving at least one valve group consisting of a plurality of valve bodies to open and close in synchronization with each valve group by an electromagnet provided corresponding to each valve body, A drive device for an electromagnetic valve, comprising: a drive circuit in which switching means for controlling an energization state of an electromagnet is collectively provided for each valve element group. 2. The electromagnetic valve driving device according to claim 1, wherein at least one valve element belonging to each valve element group is stopped from opening and closing under predetermined conditions. 3. The electromagnetic valve driving device according to claim 1, wherein each of the valve element groups includes two valve elements, and each of the valve elements is driven in a first predetermined direction. A first electromagnet to be driven and a second electromagnet to be driven in a second predetermined direction, wherein the driving circuit includes a first power supply terminal on the high voltage side and a second
And three power supply terminals connected in series with three switching means connected in series. The four electromagnets corresponding to each valve element group are connected to a different serial circuit by connecting a series connection part between the switching means. A driving device for an electromagnetic valve, wherein the driving device is arranged so as to be connected between them. 4. The electromagnetic valve driving device according to claim 1, wherein each of the valve element groups includes two valve elements, and each of the valve elements is driven in a first predetermined direction. A first electromagnet to be driven and a second electromagnet to be driven in a second predetermined direction, wherein the driving circuit is connected between the first power supply terminal on the high voltage side and the second power supply terminal on the low voltage side. First and second series circuits in which two switching means are connected in series; two switching means between the first power supply terminal and the second power supply terminal; and a second power supply terminal side And a third series circuit in which one diode arranged so as to allow a current to flow from the first power supply terminal side to the first power supply terminal side is connected in series with the diode being located at the center. Combining the four electromagnets corresponding to the body group with the third series circuit A connecting portion between the switching means and the diode,
A driving device for an electromagnetic valve, wherein the driving device is connected between a connection portion between switching means of the first or second series circuit. 5. The electromagnetic valve driving device according to claim 1, wherein each of the valve element groups includes two valve elements, and each of the valve elements is driven in a first predetermined direction. A first electromagnet to be driven and a second electromagnet to be driven in a second predetermined direction are provided, and the driving circuit comprises a first power source disposed between the first power terminal and the second power terminal. A first to a third series circuit having first to third switching means connected in series from a terminal side, wherein the four electromagnets corresponding to each valve element are respectively connected to the first series circuit. Between the connection between the first and second switching means and the connection between the first and second switching means of the second series circuit, the second and third switching means of the first series circuit; And the second and third switches of the second series circuit Between the connection portion of the grayed means,
Between the connection of the first and second switching means of the second series circuit and the connection of the first and second switching means of the third series circuit, and of the second series circuit. A connection part of the second and third switching means and the third connection part;
A driving device for an electromagnetic valve, wherein the driving device is connected between the series circuit and the connection portion of the second and third switching means. 6. The electromagnetic valve driving device according to claim 1, wherein each of the valve element groups includes two valve elements, and each of the valve elements is driven in a first predetermined direction. A first electromagnet to be driven and a second electromagnet to be driven in a second predetermined direction are provided, and the driving circuit comprises a first power source disposed between the first power terminal and the second power terminal. A first and a second series circuit having first to third switching means connected in series from a terminal side, and the first power supply between the first power supply terminal and the second power supply terminal A first switching means connected in series from a terminal side, a diode provided to allow a current to flow from the second power supply terminal side to the first power supply terminal side, and a second switching means And a third series circuit having: Between the connection of the first and second switching means of the first series circuit and the connection of the first switching means and the diode of the third series circuit, respectively, Between the connecting portion of the second and third switching means and the connecting portion of the diode and the second switching means of the third series circuit, and the first and second switching means of the second series circuit. The connection between the connection part and the connection part of the first switching means and the diode of the third series circuit, and the connection part of the second and third switching means of the second series circuit and the third connection part
A driving device for an electromagnetic valve, wherein the driving device is connected between the diode of the series circuit and the connection portion of the second switching means. 7. The electromagnetic valve driving device according to claim 5, wherein a first electromagnet corresponding to one of the valve bodies of each valve body group is connected to first and second switching means of the first series circuit. And a second electromagnet corresponding to the one valve element is connected between the connection part of the first series circuit and the connection part of the second series circuit with the first and second switching means. A first electromagnet connected between the connection portion of the second and third switching means and the connection portion of the second series circuit with the second and third switching means, and corresponding to the other valve element; The other valve body is connected between a connection portion of the second and third switching means of the second series circuit and a connection portion of the second and third switching means of the third series circuit. A second electromagnet corresponding to the first and second switches of the second series circuit. The connecting portion of means of the third series circuit 1 and a second
A driving device for an electromagnetic valve, wherein the driving device is connected between the switching device and a connection portion of the switching means. 8. The electromagnetic valve driving device according to claim 6, wherein a first electromagnet corresponding to one valve element of each valve element group is connected to first and second switching means of the first series circuit. And the second electromagnet connected between the first switching means and the diode connection of the third series circuit and corresponding to the one valve element is connected to the second electromagnet of the first series circuit. And a first electromagnet connected between the connection part of the third switching means and the connection part of the second switching means and the diode of the third series circuit and corresponding to the other valve element, A second switching means connected between the connection of the second switching means and the third switching means of the third series circuit and the connection of the second switching means and the diode of the third series circuit, and the second one corresponding to the other valve element. Are connected to the first and second electromagnets of the second series circuit. Drive solenoid valve, characterized in that connected between the first connection portion of the switching means and the diode of the third series circuit and the connection portion of the switching means. 9. The electromagnetic valve driving device according to claim 3, wherein each of the switching units includes a switching element that performs an on / off operation, and a switching element that is in parallel with the switching element.
And a diode provided so as to allow a current to flow from the second power supply terminal side to the first power supply terminal side. 10. The electromagnetic valve driving device according to claim 1, wherein an exciting current having a predetermined current waveform is supplied to each of the electromagnets by switching a combination of on / off states of the switching means. A driving device for an electromagnetic valve, comprising: 11. The electromagnetic valve driving device according to claim 10, wherein the predetermined current waveform includes a predetermined positive current waveform portion in a positive direction and a reverse current waveform portion in a direction opposite to the positive direction. A driving device for an electromagnetic valve, comprising: